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Optical fiber temperature sensor

a temperature sensor and optical fiber technology, applied in the field of optical fiber sensing technology, can solve the problems of high cost and complex manufacturing process, and achieve the effects of simple structure, high measurement accuracy and easy manufacturing

Active Publication Date: 2011-06-02
BEIJING QIRED ELECTRO OPTIC TECH LIMITED
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

The present invention provides a new optical fiber temperature sensor with the following technical effects: simple structure, high measurement accuracy, easy manufacture and low cost, and adapted for temperature measurement under high voltage condition. The sensor comprises a transmission fiber, a sensing head, and an optical transceiver module for transmitting light to the sensing head. The sensing head includes a temperature sensing element and a fiber reflector. The angle between the polarization axis of the first polarization maintaining fiber of the transmission fiber and the polarization axis of the second polarization maintaining fiber of the temperature sensing element is 45 degrees at the fusion splicing point. The sensor has high accuracy and can measure temperatures within a range of -50°C to 600°C.

Problems solved by technology

They all require spectral analysis, and have complex manufacturing process and high cost.

Method used

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Examples

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example 1

[0030]Referring to FIG. 1, an optical fiber temperature sensor according to the first preferred embodiment of the present invention is illustrated, wherein the optical fiber temperature sensor comprises an optical transceiver module 1, a transmission fiber 2 and a sensing head 3 at a distance for sensing the temperature of the measured point. The optical transceiver module 1 is used to transmit the light to the sensing head 3 by the transmission fiber 2. The sensing head 3 returns the light intensity information containing the temperature information to the optical transceiver module 1 by the transmission fiber 2, thus obtaining the temperature information of the measured point. The transmission fiber 2 is polarization maintaining fiber. The sensing head 3 comprises a temperature sensing element 301 and a fiber reflector 302, wherein the temperature sensing element 301 is a section of polarization maintaining fiber, one end of the temperature sensing element 301 is connected with th...

example 2

[0036]Based on the same principle of the example 1, another simplified embodiment can be used.

[0037]In the first embodiment, the readings D1 and D2 of the first photoelectric detector 104A and the second photoelectric detector 104B contain the temperature information, so the present invention can be simplified to be a single-path. Therefore, instead of the two-path polarization maintaining fiber, single-mode fiber can also be used as the transmission fiber 2. In the same time, a two-port polarizer 303 is used instead of the three-port polarization beam splitter 103. To minimize the effect of light intensity variation, a pair of photoelectric detectors are still used, and a four-port fiber coupler 105 is used instead of the optical circulator 102. Referring to FIG. 3, an optical fiber temperature sensor according to the second preferred embodiment of the present invention is illustrated, wherein the optical fiber temperature sensor comprises an optical transceiver module 1, a transmi...

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Abstract

An optical fiber temperature sensor includes an optical transceiver module, a transmission fiber and a sensing head. When the transmission fiber is a polarization maintaining fiber, the sensing head includes a temperature sensing element and a fiber reflector, the temperature sensing element is a section of polarization maintaining fiber. The transmission fiber is fusion spliced with the temperature sensing element, an angle between a polarization axis of the transmission fiber and that of the temperature sensing element is 45 degree at the fusion splicing point. When the transmission fiber is a single-mode fiber, the sensing head includes a polarizer. An angle between a polarization axis of the polarization maintaining fiber connecting the temperature sensing element with the polarizer and that of the polarization maintaining fiber of the temperature sensing element is 45 degree at the fusion splicing point. The present invention is of simple principle and structure, and facilitates manufacturing.

Description

BACKGROUND OF THE PRESENT INVENTION[0001]1. Field of Invention[0002]The present invention relates to an optical fiber sensing technology, and more particularly to a new optical fiber temperature sensor.[0003]2. Description of Related Arts[0004]Optical fiber temperature sensors have a wide range of applications. They use optical fiber as the optical path for separating the probe from the instrument so as to improve the environmental adaptability. The sensor can work under conditions of strong electromagnetic interference, high voltage and electrical power transmission without using any additional wire. Currently, fluorescent sensors, birefringent crystal sensors and semiconductor sensors are the major successful optical fiber temperature sensors. Most of the existing optical fiber temperature sensors are mostly based on the principle of the spectral analysis, such as the fiber grating mentioned in the reference [1] of Fiber Bragg Grating Temperature Sensor with Controllable Sensitivi...

Claims

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Application Information

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Patent Type & Authority Applications(United States)
IPC IPC(8): G01K11/32G02B6/00
CPCG01K11/3206G01K11/32
Inventor WU, SHUDONGWANG, WENBO
Owner BEIJING QIRED ELECTRO OPTIC TECH LIMITED